Pile driver attachment for rock drills



June 23, 1931. c. c. HANSEN FILE DRIVER ATTACHMENT FOR. ROCK DRILLS Filed Aug. 21, 1929 H15 ATTORNEY.

INVENTOR. I fifiazzsem (Zeal Patented June 23, 1931 UNITED STATES PATENT? OFFICE,

CHARLES c. HANSEN, or EASTON, PENNSYLVANIA, ASSIGNOR ro INGE-RSOLL-BAND COMPANIOF-JERSEY CITY, NEW JERsnY; A CORPORATION or NEW JERSEY PILE DRIVER ATTACHBIEN'I FQR ROCK DRILLS Application filed August 21, 1929. Serial No. 387,382.

This invention relates to pile drivers, but more particularly to a pile driver attachment for rock drills of the hammer type.

The objects of the invention are to expedite the sinking of a pile and to obtain a rugged and efficient device for this purpose which may be applied to and removed from the work with a minimum expenditure of time and effort.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consistsof the combination of elements, features of construction and arrangement of parts having the general mode of operation substantially as heremafter described and more particularly pointed out in the appended claims and illustrated in the accompanying drawings, in which Figure 1 is a view in elevation and partly in section of a rock drill equipped with a pile driver attachment constructed in accordance with the practice of the invention, and

Figure 2 is a side elevation of the attachment.

Referring to the drawings, the invention is shown applied to afluid actuated rock drill of the hammer type comprising a cyl1n der B having a piston chamber C wherein is disposed a reciprocatory hammer p1ston D. The rock drill illustrated is of the hand held type and accordingly has a handle whereby it may be manipulated, and said handle may be an integral portion of a back head F which forms a closure for the rearward end of the cylinder B.

In accordance with the present invention, the rock drill is provided with a driving attachment designated generally by G for driving a pile H which may project into the attachment G. The attachment G comprises a front head J which may abut the front end I of the cylinder B and has a bore K therein. Within the bore K is a bushing L to act as a guiding surface for the stem 0 of the piston I). Preferably the bushing L is of such length that its rearward end extends into the piston chamber C to form a closure for the front end thereof and also to maintain the front head J in axial alignment with the cylinder B.

v gether,

v head comprising Disposed at the forward end of the front head J is an extension P having a cylindrical bore Q WhlCl'lCOlIlPIlSBS in this instance an enlarged portion R and a smaller portion thus forminga shoulder T at the point,

of juncture of the enlarged and smaller portions of the bore. I driving block U adapted to transmit the blows of the piston D to the pile H. The driving 7 within the enlarged portion R of the bore Q, and the forward surface W of said head is adapted to cooperate with the shoulder T for limiting the movement of the driving block U in a forwardly direction. Preferably the extension P is provided in its front end and on opposite sides thereof with slots,

only one of which is shown, to receive the end of the pile H. A pointer Y is carried by the driving block to seat in the end of the pile H for holding the attachment in substantially the correct position on the pile.

In order to enable the, attachment to be applied to piles of different thickness, the slot X in the extension P is preferably of somewhat greater width than the pile of maximum thickness for which the attachment may be intended, and'at the forward end of the eX- tension P and seated against the front end thereof on opposite sides of theextension are guide plates Z which form a space 6 therebetween to receive the'pile and also toform a continuation of the slotX. In order to secure the parts comprisingthe attachment to- Z, the extension P and the front head G, are provided with registering apertures 0 to receive bolts d providedv with nuts 6 for clamping theseelements together.

I claim: A V

1. The combination with a rock drill having a cylinder and a harmner piston therein having a stem, of a front headabutting the front end of the cylinder,- a bore in the front an enlarged portion and a smaller portion, a bushing in the smaller portion of the bore forming a guide for the stem, a head on the bushing engaging both the cylinder and the front head'to maintain the front head in axial alignmentw-ith the cyl-' Within the bore Q is a 7 block U has a head V which lies said parts, such as the guide plates inder, and means in the enlarged portion of the bore for transmitting the blows. of the hammer piston to an element intended to be actuated.

2. The combination with a rock drill having acylinder and a hammer piston therein, of a front-head for the cylinder having a cylindrical bore, a driving block in the bore to receive the blows of the hammer piston, a head on the driving block, a shoulder in the bore forming an abutment for the head to limit the movement of the driving block in a forwardly direction, guide plates seated against the forward end of the front head and extending forwardly therefrom, and means for securing the guide plates to the front head.

8. The combination with a rock drill having a cylinder and a hammer piston therein having a stem, of a front head for the cylin- 'der to slidably receive the stem, an extension for the front head having a bore, a driving block in the bore to transmit the blows of the piston to an element intended to be actuated, a head on the driving block, a shoulder in the bore forming an abutment for the head to limit the movement of the driving block in a forwardly direction, guide plates seated against the forward end of the extension, and bolts extending longitudinally of the front head, the extension and the guide plates for clamping these elements together.

4. The combination with a rock drill having a cylinder and a hammer piston therein having a stem, of a front head for the cylinder, a bushing in the front head to slidably receive the stem and extending into the cylinder for maintaining the front head coaxial with the cylinder, an extension for the front head having a bore, a driving block in the bore, a head on the driving block, a shoulder in the bore forming an abutment for the forward end of the head, guide plates seated against the forward end of the extension, and bolts extending longitudinally of the front head for clamping the said front head and the guide plates to the extension.

5. The combination with a rock drill having a cylinder and a hammer piston in the cylinder having a stem, of a front head for the cylinder to slidably receive the stem, an extension for the front head seated against the forward end thereof and having a bore, a driving block inthe bore, means in the bore forming an abutment for the driving block to limit the travel thereof in a forwardly direction, a slot in the extension to receive the end, of a pile, guide plates to engage the pile, said guide plates being seated on the forward end of the front head and spaced to form a continuation ofthe slot, and means for securing together the front head, the extension, and the guide plates.

6. The combination with a rock drill having a cylinder and a hammer piston therein of the hammer piston to an element intended to be actuated.

In testimony whereof I have signed this specification.

CHARLES C. HANSEN. 

